A certain radioactive nucleus undergoes exponential decay with a half-life of 10 days. The fraction of the initial sample that remains after 2 half lives?

Which of the following reactions takes place with an increase in entropy under standard conditions? a. NH4 (aq) + CH3COO - (aq) - --> NH3 (aq) + CH3COOH (aq) b. CaO (s) + CO2 (g) - --> CaCO3 (s) c. NH3 (g) + HCl (g) - --> NH4 + (aq) + Cl - (aq) d.

Summarize the process of alcoholic fermentation in yeast

What is the reaction that joins thousands of small, identical molecules to form one very long molecule?

Which answer is expressed to the nearest milligram 1. 14.7 g 2. 14.721 g 3. 14.7213 g 4. 14.72 g

Light energy travels in the form of A. sound waves B. electromagnetic waves C. convection currents D. radiation waves

What ionic bond occurs between what particles? A. Two Negative Ions B. A positive and negative ion C. Two positive ions D. Two neutral atoms

Which of the following are good traits of a hypothesis? it will be able to be tested it can predict an outcome it will explain the observations all of these

What is the mass of a box of nails

In a phase change of water between the liquid and the gas phases, 770.1 kJ of energy was released by the system. What was the product, and how much of it was formed in the phase change? (dа ta: H₂O (l) → H₂O (g) ΔH = 44.01 kJ/mol.) A.

Explain the problem surrounding the ammonia-making process in terms of chemical equilibrium. Chemical equation for producing ammonia: N2 + 3H2 ⇌ 2NH3 + energy